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When the work is electrostatic spray gun or spray paint, spray cup, paint particles part of the negative electrode, the workpiece is connected to the cathode and grounding, in the high voltage power supply, the end of the gun (or spray cup) and the workpiece between the formation of an electrostatic field. The electric field force and the electrostatic field of the coating material is proportional to the electric quantity of the electric field, and the distance between the spray gun and the workpiece is inversely proportional to the distance. When the voltage is high enough, the air ionization zone is formed near the tip of the gun.

The film in the film, such as resin and pigment, is made of high molecular organic compounds, and more conductive to the dielectric, solvent coatings in addition to organic solvents, solvent, solvent, curing agent, electrostatic diluent, and other types of additives, etc.. These solvents, such as benzene, xylene, solvent naphtha, are mostly polar substances, low resistivity, and have a certain ability to conduct electricity, which can improve the performance of the coating.